Device for making pins with headplates



Nov. 22, 1927. 2,650,525

G. KRAIN nmvrcu Foa MAKING pms WITH HEADrLATEs Filed-Nv. s. 1924 3 sheets-sheet 1 Eggs-:nys i Nov. 22, 1927 l G. KRAIN DEVICE FO MAKING PINS WITH HEADPLATES Filed Nov. 8. 1924 3 Sheets-Sheet 2 Nw 22, i927. 1,650,525

. G. KRAIN f k mamma Fon MAKING PINS wITH HEADPLATES Filed Nov. s. 1924 sensata-sheet 5 Nov. 22, 1927.

STATES 0F SCHWARZENBERG, GERMANY, ASSIGNOR TO THE FIRM METALL- STNZWERK G. M. B. H., 0F SCHWARZENBERG, GERMANY.

' DEVICE FOB MAKING PINS WITH HEADPLATES.

Application filed November 8, 1.924Seria1 No. 748,683, and in Germany November 12, 1923.

This invention relates to a method and machine for the production of thumb tacks, tacks for upholstering, for fixing carpets, pins for ixing Ywandshooks, and the like,

that is to say of tacks of that type in which the pin is not stamped from the head plate but is inserted in the same. Hitherto such tacks have been made in the followin mannerz-The head plate vwith a central ole or- Acavity designed for the pin is stamped from a strip `or-band of sheet metal whereupon the pin is inserted into said head plate and lsecurely fixed in the same. The fixing of the pin in the head plate in this case is done either by hand or with'the aid of: special tools or machines in a special workin step.

According to the present invention proceed in the following manner The strip or band of sheet metal is first provided with 2@the holes or cavities for inserting the pins whereupon the end of a wire whichdis continuously fed to the working place is Yconnected with thecontinuouslyy fed perforated strip or band of sheet metal,- the pin being then either at the same time and on the same spot or subsequently cut from the wire and shaped (pointed) `whereupon the head plate is :finallyl stamped out of the strip or band of sheet metal. The thumb tacks or other tacks and pins thus are ready for use Awhen thehead plate is stamped out of thestrip and they are manufactured in one op;

eration or during o ne revolution of the shaft of the machine employed.v The thumb chanically produced roma continuous band of sheetv metal and from a continuous wire in one operation while hitherto at least two operations and at least two separate devices were necessarytor the same work.

In this manner as well the so-called riveted pins the point of which is fixed in the head plate by riveting, as the so-called sunk pins in which the end of the wire or the point is .sunk in the head plate, aszalso the so-called capsuled pins can beproduced;

The working method and a device for car.

rying the same into effect are illustrated, by way of example, in the accompanying drawings,4in which I Figs. 1, 2, 3 and 4 illustrate diagrammati` -cally dierent forms ofthe improved working method for the production of thumb tacks. f Fig. 5 shows partly in full lines and parte tacks ready for use are consequently me# ly in longitudinal section on line B-B of Fig. 6 one form of execution of a device for carrying out the working method, the stamping means for the head `plates and the .capsuling means being shown in dotted lines.

'-Fig. 6 is a cross section-on line-A-A of Fig. w

Fig. 7 shows on a larger scale a construetional detail of Fig. 5. y I

Fig. 8 is a detail vertical sectional view on a larger scale of the parts shown in Fig. 6 for stamping out the head plates of the pins. Fig. 9 is a similar view of the parts for applying the capsules to the head plates of the pins.

Fig. 10 is asimilar view of the parts for forming the capsules for the head plates of the pins. v

In carryin out 'the improved working method for t e production of riveted pins, tacks or needles the hole b for the reception .of the wire is first punched into a continu'- ous strip (Fig.-1) whereupon the wire z' is fed, the end .7c of the wire is cut olf and at .the saine time inserted. through the hole I),

Vand it is then firmly riveted therein. Then the wire end 7c is sharpened at another working place to form a point c. The sharpening of the cut olf wirel end k1 could however also be done according to Fig. 2 at 'the same working place at which the cutting oi from the wire 1 and the connection of the end k1 with the strip a is effected. In both these cases the head plate i with the point or pin o riveted in the same is subsequently stamped out of the continuous strip a. All these operationscanbe executed in lone working phase and by one and the same machine the one directly after or simultaneously` with thel other, and the thumb tack or the like is thus produced in one opera-tion and during one ksingle revolution of the machine sha-ft. v

When A,tacks with sunkA pins or points are to be produced a cavity. e (Fig. is first pressed intoV the'strip or band a1 the end of `wire i2 is. notched and cut oli", and the cutoff piece czis pressedinto said cavity e and 1s upset. At the. next Working point the wire end 7c is fastened in the cavity by further squeezing the material of the band a and at the same time is sharpened so as to form the point or pin e1. The

. applied.

head plate d1 togetherA with the pin c1 is then stamped out of the strip or band a and s imultaneously a vaulted orm is given to this head plate. All these performances too are executed in direct succession or simultane-4 ouslv in one working phase.

When eapsuled tacks have to be produced according to Fig. 3 the continuous band a of sheet met-al is first perforated to form' hole b whereupon the wire i3 from which the pin c2 is made at the same time with or, as shown, after its being connected with the band of sheet metal a by cutting off and pointing, is inserted through the hole b. Then the head g of the point or pin is produced by upsetting, and -the bead plate d2 together with the point c2 1s stamped out of the band a of sheet metal, immediately pushed into the capsule h arranged under that place where the head plate (Z2 is stamped out, whereupon the edges of the capsule h are bent around those of the head plate cl2. Instead of producing a point with an upset head the point. c2 might also be riveted in the hole b, in a similar manner as shown in Figs. 1 and -2 with reference to the pin c. sunk pin of the type shown in Fig. 4 could also be used for the production of capsuled tacks.

The manufacturing of the capsuled tacks can also be carried out in one single working phase and with the aid of one single machine. The capsules for the tacks can be made as usual from metal, celluloid or other convenient material employed in the form of a band or strip.

The wire for making the points or pins can be taken either from a bobbin or from straight wire (having the form of a long, thin rod). In the described manner drawing pins, carpet tacks, tacks'for upholstering, pins or needles for fastening wall-hooks, or in short, all kinds of needles and pins can be produced the point or needle of which is inserted into a head plate.

Several holes or cavities may be produced at the same time in the continuous band of sheet metal and several wires or pins may be attached to the endless band at the same time, several head plates with the pins being in this case stamped out at the same time.

More than one pin might further be fixed in one head plate also where the improved working method of the present invention is For carrying out the improved working method a devlce-as shown by example in Figs. 5 to 9 can preferably be used. The machine shown is especially adapted .for lthe production of drawing pins or the like riveted in the head plate and capsuled. In Figs. 5 and 6 the several parts of the device are shown in their lowest position of working.

The-apparatus or device shown on the drawing is preferably mounted on a multiple-acting press of commonly used construction which is not shown.

In the lower surface of the top part 1 of the device which part may be fastened to one of the tool-holders of the press employed a holder 7 for the punch 8 (Fig. 5) is inserted which carries the punching needle 8. At a certain distance from this punching needle and under the same the cutting plate 9 for the punching needle is arranged. This cutting plate is sunk into a plate 4 which is fixed on the base plate 2, a plate 3 being inserted between the base plate and plate 4. A stationary guide plate 6 is arranged between the punch holder 7 and plate 4, this guide plate having a hole designed to guide the punch 8.

In the' top part 1 a vertical channel is arranged at some distance at the side of the holder 7 In this channel a guide sleeve 11 for the wire 10 is mounted. This guide sleeve 11 projects at the lower end from the top part 1 and through a plate 13 fixed on the 'lower surface of this top part 1. This plate 13 serves to guide the cutting jaws for cutting the end of the wire 10 and it has, with this object in view, a bore 13 extending in downward direction. In this bore 13 the jaws 12 for cutting the end of the wire 10 are guided so that they can be moved towards one another. The tapered lower ends 12 of these jaws 12 project from the guide plate 13, and they are adapted to engage with a bore of a plate 14 arranged under plate 13 but independently of this plate. The walls of the bore of this plate 14 are slightly conically tapered in the direction to the lower end of said bore. riveting set or die' 15- is arranged below the cutting jaws 12 and at a certain distance therefrom, saidl riveting die projecting through cross bores of the plates 2 and 3 in `which it is guided and further through a corresponding bore of plate 4 which latter bore is slightly wider than the other bores.

At some distance from the bore 13 a second bore 13 parallel to the bore 13 is arranged in the guide'plate 13. The lower end of this bore 13 is conically enlarged. Two shaping-jaws 16 project from below into the bore 13" and 'have inclined surfaces 16 corresponding with the conical part of the bore 13's. The lower ends of the shaping-jaws 16 rest upon a plate 17 adapted to be raised and lowered and having holes for passing the points 53, 54 and 55 connected with the strip 5 of sheet metal. The two shapingjaws 16 are provided with incisions 164 in their side-walls. Below the shaping-jaws 16 and the plate 17 and at a certain distance therefrom a counter `pressure bar 18 is adjustably arranged in the supporting plates 3 and 4 and held by an adjusting screw 19.

Thisadjustingscrew is screwed into an in-` ternally threaded bore of the base plate 2'.

One portion of the top part 1 is provided with a hole 56. Under this portion of part 1;

erses a cross bore of a guide plate 23 which,

by means of supports 23', is fixed on plate 4. Below the cutting die 21 a bore 4 is arranged in plate 4, in the upper end of which a ring 22 is inserted which has cutting edges designed to co-operate with the correspondingcutting edges of the cutting die 21.

A, rod 26 projects through the hollow cutting die 21 and has in its lower end a bore 26. designed to accommodate and hold the pin during the cutting out of the head plate and during the covering ofthe same by a cap. The rod 26 is inserted at its upper end intothe lower bored end of a rod 24. In theJ bore 24 of rod 24'sJ spring 25 is inserted above the upper end of rod 26. The rod 24 is guided in a sleeve 24a fixed in the top part 1, and the upper end of rod 24 is fixed in a head plate 27 adapted to be raised and loweredl in vertical direction independently of the top part 1. Behind the head plate 2O a tool head 28 is fixed to the lower surface of that portion of the top part 1 in which the aperture 56 is arranged, this tool hea-d having an aperture 28 and carrying on its lower surface the head plate 33. Into this head plate' 33 a cutting die 32 for the tool designed for producing the capsule' is' in serted.. The cutting die 32 is guided in a bore of a guide plate 29 fixed to a plate 30 by means of supports which are not shown.

f Plate 30 is fixed by corresponding, not shown supports on the plate 2. Between plates 2 and 30aslide 40 is arrangedadapted to be Imoved from backward to forward and vice versa, and inserted into a corresponding guide of the base plate 2. In the plate 30 belowthe cutting die 32 a bore 30 is a1'- ranged into which a cutting ring' 34 is inmovably arranged( Theupperendfof this serted adapted to ,co-'operate with the cutting die 32..'4 j Y In the hollow 4'ciitlting die 32"2a die 34 for drawing the cap'. or capsule"offthepins is die 34 is fixed on a headplate-B vwhich is fixed itself by meansof 'connecting-bolts 36 of which the one is shownA broken away for clearness sake) to a plate 37. The bolts 36 traverse bores 1 of the top part 1. The plate 37 is mounted on a tool-carrier of the press, not shown on thedrawings, which tooll carrier can be movedup a-nd down inde- 'The cutting and drawing ring 34 has Vonits inner surface a circumferential shoulder 34".

In front of plate 37 a second late 45 is fixed to the same tool-carrier of t e press as plate 37 and is connected by means of bolts 44 (of which also the one is shown as being broken away) with a part 43. This part 43 is holding two jaws 46 and 47 having bevelled outer faces. Two sliding plates 48, 49 having correspondingly bevelled inner faces 48 and 49 are acting uponsaid jaws 46, 47.'

In theforward end of the slide'block or slide 40 a groove is arranged on its surface for inserting the capsule for the pin to be manufactured. Behind this groove a pin 41 is arrangedbn a spring in the slide 40, said pin 41 acting s an abutment for the capsule or cap during its being moved forward. 'In the base plate 2 below the jaws 46, 47 a half ring 42 isarranged on a spring 42', said half ring serving as a butt for the capsule-moved forward by the slide 40. Behind-the studs 46 and 47 of jaws 46, 47 and directly above the slide-block 40 a plate 50 is fixed to ,the plate 30 connected with. base plate 2, said plate 50 serving for ejecting the finished pins when the slide is moving back'. Below the jaws 46, 47 the base plate 2 has a hole l52 through which the finished pins drop upon a delivery place. i 'I y The operation of the apparatus is as follows The band 5 of sheet metal for the head plates of the thumb .tacks or the like is conveyed by means of a conveyor, not shown, to and through the apparatus, the wire 10 fromwvhich the points or pins are' to be made being fed to the guide sleeve 11 from a 'bobbin or the like through the intermediary of a wire feeding mechanism, not shown.

When the top part 1, mounted onl the main tool-carrier of the press, is descending' the pin 8" of the punch 8 punches a hole in the band 5. The part of band 5 which has just been perforated is then brought under the guide sleeve 11 and the jaws 12 where the wire 10 is fed; The end of this wire is 4cut off by means of the jaws 12, 12 advancing into the hole of plate 14. Then the cut wire end is immediately inserted through the hole of band 5punched before and then at once is riveted inthe band Ofksheet metal 5 by means of the lower4 end fa"v f th'e'jaws 12 on the one hand, and byfme being moved upwards by means of notshown levers arranged on the press. v

When the band of sheet iron 5 with t e wire ends riveted therein continues to a ing jaws 16. The shaping jaws are pressed together byA the inclined' faces-of plate 13 acting-'upon the inclined faces 16 at the descending movement of the top part l, whereby the pointon the piece of wire or t effthe ,Set` or die 15 on the other hand, saidset or Idie'15l vance these wire ends get between the shap- ,125

. same is moving .along the inner surface F 38 which is thus gin 54 is formed. The apertures 16 serve uring this time .to give ro'om to the ends of the preceding, already sharpened pin 55 and of the following pin 54. The plate 17 can serve for removing the burr after the shaping and sharpening of the points.

lVhen the advancing continues further the band of sheet iron 5 with the pins gets under the cutting die 21 '(F-ig. 6). At this moment thel elements are in the mutual positions shown in Fig. 8, wiz, the lower end of rod 26 is approximately at the same height or somewhat higher than the lower end of the die 2l and descends firstly with this die, so that, at the moment when the cutting die 21 through the movementof the top part 1 is pushed over a point of the band 5, this point engages with the bore 26 of rod 26 and is thus held. At the further descending of the die 21 the head plate is stamped out of thesheet iron band 5. As soon as this has been done the rod 26 descends farther owing to the descending movement of plate 27 and rod 24, and pushes downward the vpin with the stamped out head plate.

In Fig. 5 the strip 5 is shown inthe positionwhich it will have after the three first steps of operations. It is assumed that the strip 5 before the beginning of the working has beenI pushed through the machine to such an extent that it can be gripped by a conveying device of known type which is to be arranged to the left of the machine and which is not shown in the drawing. It is by this conveying device that the strip 5 and the blanks formed therefrom by the fastening theretoof the wire ends are fed through the several stations of the cycle of operation.

Prior to this the bandor strip-material 31 for the production of the capsules or caps has been brought under the cutting die 32 by the aid of a conveying means, not shown. Bythis cutting die 32a plate of somewhat greater diameter is stamped out of the band material 31 than that which is stamped out by the die`21 from the band 5. The movement of thecutting die 32 for the capsule isV caused by the head plate 33 simultaneously with the descending of the top part 1. Immediately after the stamping of the small plate for the capsule by means of the die 32 this small plate is pushed farther'down by the drawing ram or die 34 which is operated by 37 which, together with the plate 45, 1s mounted on a second tool-holder of the press. The drawing ram 34 pushes the small plate into the hollow space of plate 30, and in doing so the shape of a capsule is given to the small plate when the 34b of the cutting and drawing ring 34, the edges of the small plate being folded over. By the spring-controlled pin 39 the capsule formed is brought in down- `stamped "sequently the jaws 46, 47 descent wardl direction on the slide-block 40. At this instant the slide-block 40 is in such a position that the capsule 38 formed in the preceding downward movement of parts 1 and 37 and lying in the groove of the slideblock 40 before pin 41 is worked by the jaws 46 and 47 within said groove of slide-block 40. (To see Fig. 9.) After the thus formed object has been finished the slide-block 40 is moved backwards by means of levers arranged on the press andnot shown in the drawing. in such a manner that its groove arranged before pin 4l comes under hole 30 and that the freshly formed capsule 38 enters into said groove. Now the slide-block 40 is advanced again, capsule 38 borne in said groove passing below plate 30 and bcing finally pushed against the half ring 42. The tack or pin which has been previously out of the band 5 by means of die 21 is then inserted by the dethe cap 38 lying under the plate and con- By the action of the inclined faces 48', 49 of the plates 48, 49, laterally moved by not shown levers, uponthe corresponding inclined faces of the jaws 46, 4 these jaws are pressed the one towards the other during their downward movement. By the studs 46', 47 which have grooves in theiry lower faces pressing on the edges of the capsule the flanving of the edge of this capsule is produce which. thereby is being folded around the head plate of tack or pin 51. The tack is now finished. The rod 26 ascends again, the jaws 46, 47 being still closed thus holding the pin 51 which 1n this way is removed from the bore -of rod 26.

cutting scendmg rod 26 into the same, whereupon Itis only then that the jaws 46 and 47 open and ascend with part 43 in releasing the capsuled pin 51. At the return movement of slide-block 4() the point of pin 5l strikes against the plate whereby the pin is stripped off slide-block 40 and drops through the hole 52 onto the delivering place. In the further backward movement of the slide-block 40 the next following cap 38 which has been produced in the meantim'e gets in the groove before the elastic pin 41, the other velements having, in the meantime returned to their initial position so that the working operation can begin again.

'If riveted or vsunk tacks without capsules have to be made with the aid of the machine the element designed for'producing the caps 38dand for feeding these caps may be omitte The sharpening and shaping of the cut off wire ends may be carried out, if desired, at the sa'me 'point as the cutting off, viz, by means of the jaws 12 which iu this case must be shaped accordingly. In this case the jaws 16 may be omitted. The removing of the the burr from the points may be carried out another manner and at another point than described, for instance the jawsul could bke used also for removing the burr. The shaping and sharpening of the riveted wire end could, if desired, be carried out at more points than shown and by other means than the jaws. Previously perforated sheet metal could also be used so that the punch 8 may be omitted. The feeding ofthe wire and of the strip of sheet metal must not necessarily be eiected by the press itself. The band of sheet metal may be o any desired width and several tacks might be simultaneously produced the oneA at the side of the other; in

9this case the represented tools must correspondingly be multiplied.

For clearnes's, sake the wire ends are not shown on the drawings on the band of sheet metal 5 behind the place where they are united with the\band but only some of them are shown at those places where the-further treatment takes-place', e. g. under the jaws 16 and under the die 21.

` with head plates from continuously fed wire means for connectin and a continuously fed strip of sheet metal, the end of said wire with said sheet meta strip, means for cutting oi the end of said wire, means for shaping and sharpening said cutoff wire end, means for stampin out head plates from said sheet metal strip, means beyond and in linel with said head plate stamping means r capsuling said stamped out head plates f the pins, a rod for projecting the pins after the head plates are stamped out directly to the capsuling means, meansfor stamping out capsuling plates, means for shaping said capsule plates, and means for feeding the shaped capsules said capsul ing means.

2. In a machine lfor the production of pins with head plates, a hollow 'cutting die for stamping Vsaid head vplates from a. strip of sheet metal, means 'arranged directly below said hollow cutting die for pr the /edges of capsules aroundV the edges o said head plates, and a rod movable thro h'lsaidl p atesv hollow cutting die to project said h 'into the capsules.

3. In al machine for the production of pins with head plates from continuously fed wire and a continuously fed strip of sheet metal,

ahollow cutting die for stamping out said head plates, means for forming and for ap# plying capsules to said head plates, and a suitably operated rod passing through said hollow cutting 'die to project said stamped .out head plates' directly to said capsullng means. l

4. In a machine for the production of .pins

with head plates from continuously fed wire and a continuously fed strip of sheet metal, means for stamping out and applying'said head plates to the pins, means for applying capsules to said head plates, said means comprising a slide block having a groove to receive the capsule, a spring projected pin' and a spring projected half-ring serving as abutf ments for the capsule, and a pair of'suitably operated jaws having studs provided in their lower ends with grooves and ada te to engage and press the edges of the apsule around the head plate of the pin.

5. In a machine for the production of pins with head plates from wire and a strip of sheet metal, means for stampin said head plates from said strip of metal a r the pins have been applied thereto, means for forming capsules for said head plates, said means comprising a hollow cuttin die for' stamping capsule plates from a seet of material fed thereto, a capsule shaping-ring arran ed below said cutting die, a pin mova le through said hollow cutting die to project said capsule plate with said shaping-ring, and means for feeding said capsules to a. point immediately below and in 'line with the axis of the stamping out means of said head plates.

In testimony whereof I have hereunto set my hand.

- GEORG lgitAillN. 

